Pandas to Polars Migration | 03A

🚀 Course: Pandas to Polars Migration
🔁 Module 03: Transformations and Pipelines
🧠 Lecture A: Groupby and Aggregation

👇 Link to the notebook:
https://tinyurl.com/29r7y9fv

🚀 Polars groupby and aggregation tutorial for pandas users: learn how to translate common pandas groupby code into equivalent Polars expressions, use Polars window functions to replace rolling calculations, and validate that Polars results match pandas across multiple groups and metrics. This lecture walks through single-key and multi-column groupby examples, aggregation basics, custom aggregation expressions, multi-column window aggregations, and missing data strategies, all with side-by-side pandas vs Polars Python code. Watch to understand Polars DataFrame syntax, cumulative metrics validation, and how to migrate real analytics workflows from pandas to Polars with confidence, then continue the course to deepen your Polars skills.

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